• Industrial Engineering and Management Systems
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• 제11권3호
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• pp.233-240
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• 2012

The implementation of business process management (BPM) systems in large number of business organizations transforms BPM system into such a level of maturity and tends to collect large repositories of business process (BP) models. This issue encourages BP flexibility that leads to a large number of process variants derived from the same model, but differing in structure, to be stored in the large repositories of BP models. Therefore, the repositories may include thousands of activities and related business objects with variation of requirements and quality of service. It is a common practice to customize processes from reference processes or templates in order to reduce the time and effort required to design and deploy processes on all levels. In order to address redundancy and underutilization problems, a generic process model, called as reference BP, is absolutely necessary to cover the best of process variants. This study aims to develop multiple-objective business process genetic algorithm (MOBPGA) to find a set of non-dominated (Pareto) solutions of business reference model to enhance conventional approach which considered only a single objective on creating BP reference model by using proximity score measurement. A mixed-integer linear program is constructed to evaluate performance of the proposed MOBPGA on small-scale problems by using standard measures for multiple-objective techniques. The results will show the viability of applying MOBPGA in terms of simultaneously maximizing proximity score measurement, minimizing total duration, and total costs of the selected reference model.

• 지능정보연구
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• 제19권4호
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• pp.133-146
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• 2013

본 연구는 매체에 따른 정보확산차이와, 정보유형을 근접성의 정도로 분류하여 정보확산차이를 보고자 하였다. 이는 기존의 전통매체인 종이신문이나 TV, 라디오와 같이 일방적으로 전달되는 매체의 정보확산과는 달리, 온라인 뉴스나 소셜네트워크서비스와 같이 쌍방향적 소통이 가능한 매체 특성으로 인한 정보확산은 차이가 있을 것이라 판단하였다. 따라서 본 연구에서는 개인이 직접 기사를 올리고 다른 사람들과 공유할 수 있는 블로그(Blog) 매체와 온라인 뉴스(News) 매체에 따른 정보확산차이를 비교해 보고자 하였다. 또한 심리적, 지리적 근접성에 따른 정보확산차이를 보고자 정보의 유형을 세분화 하였다. 이는 수용자가 정보의 근접성이 높고 낮음의 차이 정도에 따라 정보유형에 따른 가치평가의 기준이 다를 것이라 보았다. 정보유형은 연예, 시사(국제), 제품으로 선정하였고, 세부내용은 연예와 관련된 '싸이 젠틀맨', 시사와 관련된 '중국 쓰촨성 지진', 제품과 관련된 '갤럭시 S4'를 선택하였다. 본 연구의 분석방법은 Bass 확산모형을 이용하여 증명하고자 하였다. Bass 확산모형은 혁신효과(Innovation effect)와 모방효과(Imitation effect)로 나눠서 측정한다. 혁신효과는 서비스 초기에 영향을 미치는 변수로 추정가능하며, 모방효과는 서비스 초기 단계 이후에 영향을 미치는 변수로 구전의 영향을 받는다고 볼 수 있다. 본 연구 결과 첫째, 매체에 따른 정보확산 흐름은 비슷하게 나타났다. 비록 두 매체의 특성에 차이점이 있을지라도, 뉴스가치 중 하나인 근접성에 따른 정보확산은 비슷한 형태를 보인다고 할 수 있다. 두 번째, 근접성에 기반한 정보유형별 정보확산에는 차이가 있었다. 수용자 입장에서 관련성이 높은 제품과 연예는 모방효과가 높게 나타났으며, 시사의 경우는 모방효과보다 혁신효과가 높게 나타났다. 이는 제품관련 정보나 연예관련 정보와 같이 개인에게 심리적으로나 지리적으로 근접성이 높은 정보는, 국제 재해와 관련된 시사정보와 같이 근접성이 낮은 정보에 비해서, 개인의 모방효과가 활발히 진행된다고 볼 수 있다. 연구결과를 통해 매체와 정보유형에 따라 정보확산 흐름변화를 고찰하여 실무에 활용한다면 도움이 될 것이라 본다. 하지만, 정보유형을 각각 하나의 기사만을 택하여 보았기 때문에 이 결과를 통한 정보확산 차이라고 규정짓기에는 sample size가 너무 작아 일반화에 어려움이 있다. 향후 연구에서는 소셜미디어 종류를 블로그 뿐 만 아니라 다양한 소셜미디어를 추가하여 비교해 볼 필요가 있을 것이다. 또한 정보의 유형을 근접성 측면뿐 만 아니라 다른 측면도 고려해 봐야 할 것이다.

• 한국지반공학회지:지반
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• 제1권2호
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• pp.81-92
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• 1985

일반적으로, 지반의 굴착은 주변지반의 응력해방에서 응력재배치 과정을 거치는 동안 지반변형을 포함한 여러가지 토질공학적 문제를 수반하게 된다. 이러한 문제들은 특히, 밀집된 고분건물사이에 새로운 건물을 건축하기 위한 굴착을 하는 경우, 인접한 기존건물의 안정과 연관된 문제들을 유발하게 되어 굴착방법이나 시공관리에 있어서 많은 기술적인 노력을 필요로 한다. 본 연구는 이와 같은 문제들을 수반하는 사질토 지반에서의 깊은 굴착문제를 다루고 있는데, 연구대상지역은 상기와 같이 기존건물 및 부속시설이 굴착면에 매우 근접하여 있고, 신축건물의 기초가 신접건물의 기초보자 아래에 위치하는 특징을 내포하고 있다. 본고에서는 이러한 현장특성을 갖는 굴착지반에 대하여 탄소성 유한요소해석을 수행, 지반변상를 예측하였고, 계측 System을 도입하여 지표, 수중수평변이, 건물거동 등을 측정, 굴착에 따른 변형 특성을 고찰하였다.

• Industrial Engineering and Management Systems
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• 제8권3호
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• pp.171-180
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• 2009

Population learning algorithm (PLA) is a population-based method that was inspired by the similarities to the phenomenon of social education process in which a diminishing number of individuals enter an increasing number of learning stages. The study aims to develop a framework that repeatedly applying the PLA to solve the discrete resource constrained project scheduling problem with two objectives: minimizing project makespan and renewable resource availability, which are two most common concerns of management when a project is being executed. The PLA looping framework will provide a number of near Pareto optimal schedules for the management to make a choice. Different improvement schemes and learning procedures are applied at different stages of the process. The process gradually becomes more and more sophisticated and time consuming as there are less and less individuals to be taught. An experiment with ProGen generated instances was conducted, and the results demonstrated that the looping framework using PLA outperforms those using genetic local search, particle swarm optimization with local search, scatter search, as well as biased sampling multi-pass algorithm, in terms of several performance measures of proximity. However, the diversity using spread metric does not reveal any significant difference between these five looping algorithms.

• Earthquakes and Structures
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• 제9권4호
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• pp.719-733
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• 2015

Seismic risk management of the built environment is integrated by two main stages, the assessment and the remedial measures to attain its reduction, representing both stages a complex task. The seismic risk of a certain structure located in a seismic zone is determined by the conjunct of the seismic hazard and its structural vulnerability. The hazard level mainly depends on the proximity of the site to a seismic source. On the other hand, the ground shaking depends on the seismic source, geology and topography of the site, but definitely on the inherent earthquake characteristics. Seismic hazard characterization of a site under study is suggested to be estimated by a combination of studies with the history of earthquakes. In this Paper, the most important methods of seismic vulnerability evaluation of buildings and their application are described. The selection of the most suitable method depends on different factors such as number of buildings, importance, available data and aim of the study. These approaches are classified in empirical, analytical, experimental and hybrid. For obtaining more reliable results, it is recommends applying a hybrid approach, which consists of a combination between methods depending on the case. Finally, a recommended approach depending on the building importance and aim of the study is described.

• 한국항해학회지
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• 제18권2호
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• pp.41-56
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• 1994

This paper was a part of the risk management in planning a channel. It utilized Korea Marine Training & Research Institutes(KMTRI) which Houses a real-time, full-mission shiphandling simulator to examine the safety of the ship's transit in the planned channel of Asan port. 6 competent Captains participated in this study. The vessel modelled was a 60,000-ton ship. The two variables(factors) examined were environ-mental conditions such as flood-and-ebb current condition and day-and-night condition. The two variables were combined to produce four experimental conditions. To evaluate the safety of the environmental conditions, two categories of performance measures were analyzed. They were vessel's proximity to channel boundary and vessel controalbility. The findings regar-ding the effects of environmental conditions were as follows : - Closest Point of Approach(CPA) to channel boundary was enough for 60,000-ton ship to transit th-rough the channel with 99.999% confidence level. - Closest Point of Approach(CPA) to channel boundary further was under against-current condition than under with-current condition. -Vessel controlability was better under against-current condition than under with-current condition. -Vessel controlability was better under inbound transit than under outbound transit.

• Smart Structures and Systems
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• 제25권6호
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• pp.733-749
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• 2020

This study presents a computer vision-based approach for representing time evolution of structural damages leveraging a database of inspection images. Spatially incoherent but temporally sorted archival images captured by robotic cameras are exploited to represent the damage evolution over a long period of time. An access to a sequence of time-stamped inspection data recording the damage growth dynamics is premised to this end. Identification of a structural defect in the most recent inspection data set triggers an exhaustive search into the images collected during the previous inspections looking for correspondences based on spatial proximity. This is followed by a view synthesis from multiple candidate images resulting in a single reconstruction for each inspection round. Cracks on concrete surface are used as a case study to demonstrate the feasibility of this approach. Once the chronology is established, the damage severity is quantified at various levels of time scale documenting its progression through time. The proposed scheme enables the prediction of damage severity at a future point in time providing a scope for preemptive measures against imminent structural failure. On the whole, it is believed that the present study will immensely benefit the structural inspectors by introducing the time dimension into the autonomous condition assessment pipeline.

• 융합보안논문지
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• 제18권2호
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• pp.19-24
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• 2018

이 연구에서는 사이버 위협을 평가할 시 복합적인 요소들을 고려한 위협 수준의 정량적 평가방안을 제안하였다. 제안된 평가방안은 공격방법과 행위자, 위협유형에 따른 강도, 근접성의 4가지 사이버 위협 요소를 기반으로 퍼지이론을 사용하여 사이버 위협 수준을 정량화하였다. 본 연구를 통해 제시된 사이버 위협 수준 평가는 언어로 표현된 위협 정보를 정량화된 데이터로 제시해 조직이 위협의 수준을 정확하게 평가하고 판단할 수 있다.

• 무역학회지
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• 제44권3호
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• pp.227-252
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• 2019

This study explores the effects of exports on the innovation of Korean firms listed on two Korean stock markets, the Korean Stock Exchange and the Korean Securities Dealers Quotations, between 1999 and 2016. By matching exporting firms to non-exporting ones with propensity score matching, this study accounts for a problem from sample selection bias that may arise from differences in firm-characteristics between the two groups. From the study results, first, both export participation and export volume significantly increase subsequent innovation performance, as measured by the number of patent applications. This result seems to support the "learning by exporting" hypothesis for Korean listed firms. Second, both export participation and export volume narrow innovation scope, proxied as the number of unique International Patent Classification (IPC) codes of the patent applied, the degree to which patents are concentrated in a particular class, and the degree of proximity in the patents. The findings of innovation scope suggest a possible explanation that the learning effect appears in familiar technology fields that firms have previously held, rather than in unfamiliar ones. Third, these results are robust using alternative proxies in the innovation scope, Tobit regressions to consider the non-trivial portion of sample firms with patent applications equal to zeros, and generalized method of moments (GMM) to control for the persistence of innovation measures hearing over years. Finally, the two main results are more pronounced in large firms than in small and medium-sized ones. As for Chaebol firms, however, these results do not appear.

• Journal of the Korean Physical Society
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• 제73권10호
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• pp.1589-1595
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• 2018

Similarity index measures the topological proximity of node pairs in a complex network. Numerous similarity indices have been defined and investigated, but the dependency of structure on the performance of similarity indices has not been sufficiently investigated. In this study, we investigated the relationship between the performance of similarity indices and structural properties of a network by employing a two-state random network. A node in a two-state network has binary types that are initially given, and a connection probability is determined from the state of the node pair. The performances of similarity indices are affected by the number of links and the ratio of intra-connections to inter-connections. Similarity indices have different characteristics depending on their type. Local indices perform well in small-size networks and do not depend on whether the structure is intra-dominant or inter-dominant. In contrast, global indices perform better in large-size networks, and some such indices do not perform well in an inter-dominant structure. We also found that link prediction performance and the performance of similarity are correlated in both model networks and empirical networks. This relationship implies that link prediction performance can be used as an approximation for the performance of the similarity index when information about node type is unavailable. This relationship may help to find the appropriate index for given networks.